@charset "utf-8";
@function bfb($b){
    @return $b/1920*100%;
}
@function bfbl($b){
    @return $b/1477*100%;
}
.web{
    img:hover{
        transition: all 0.5s; 
        transform: scale(1.1);
    }
}
.center{
    width: bfb(1477);
    margin: 0 auto;
}
.banner{
    width: 100%;
    margin-bottom: 30px ;
    .img{
        width: 100%;
        overflow: hidden;
        img{
            display: block;
            width: 100%;
        }
    }
}
.con{
    width: 100%;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    li{
        width:bfbl(457);
        overflow: hidden;
        margin-bottom: 30px;
        img{
            display: block;
            width: 100%;
        }
    }
}
.btna{
        display: block;
        width: 258px;
        height:48px;
        margin: 0 auto;
        font-size: 16px;
        text-align: center;
        letter-spacing: 1px;
        border: 1px solid #000000;
        line-height: 48px;
        margin-top: 70px;
        color: #000000;
        margin-bottom: 80px;
    }
    .btna:hover{
        background: rgba(150,150,150,.5);
    }
@media only screen and (max-width:768px){
    .center{
    width: 96%;
    margin: 0 auto;
}
.banner{
    width: 100%;
    margin-bottom: 10px ;
    .img{
        width: 100%;
        overflow: hidden;
        img{
            display: block;
            width: 100%;
        }
    }
}
.con{
    width: 100%;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
        li{
            width:bfbl(457);
            overflow: hidden;
            margin-bottom: 10px;
            img{
                display: block;
                width: 100%;
            }
        }
}
.btna{
        display: block;
        width: 150px;
        height: 38px;
        margin: 0 auto;
        font-size: 14px;
        text-align: center;
        letter-spacing: 1px;
        border: 1px solid #000000;
        line-height: 38px;
        margin-top: 20px;
        color: #000000;
        margin-bottom: 30px;
    }
    .btna:hover{
        background: rgba(150,150,150,.5);
    }
}
